POLARCHROMIC COPPER provides increased color definition and medium contrast while reducing reflected glare from water, sand, or pavement. An exceptional general purpose Polarchromic lens that is comfortable and soothing to wear all day.

So like, pretty much the opposite of your old, casual bejeweled cat-eye shades.

The Smith Parallel D-Max Sunglasses were designed with cycling, running, and other active outdoor pursuits in mind. The medium-sized frame boasts extra-large lenses and a nine base curve for a good, snug fit with adequate coverage. When the light changes, swap out the lenses with the included lenses to provide the right definition.

The scratch-resistant Carbonic TLT (Tapered Lens Technology) lenses provide supreme clarity and distortion-correcting optics (the lens is thicker in the middle and tapered towards the outer edges) so you have a true optical center

Hydroleophobic lens coating is applied to the top of the lens to repel moisture and grease and make cleaning easy

POLARCHROMIC COPPER provides increased color definition and medium contrast while reducing reflected glare from water, sand, or pavement. An exceptional general purpose Polarchromic lens that is comfortable and soothing to wear all day.

Comment on Brett Clatt's review:

Great shades for active pursuits

My go-to sunglasses for all my trail running ventures. The Parallel D Max is insanely light and very low-key, but still provides great coverage. I have a small face size and these fit me very well. I did not purchase extra lenses, so I am unable to comment on how simple it is to swap them out.

I find that these guys will fog up- generally when I come to a stop or walk during or after a run- but I can't say that I've ever worn a pair of shades that did not fog up during moderate to strenuous activity.